Former President George W. Bush is calling former President Clinton his “brother from another mother.”

The ex-presidential pair has made no secret of their affection for one another.

On Wednesday, Clinton tweeted a photo of himself reading Bush’s new memoir about his dad, 41: A Portrait of My Father. The former commander in chief posted to his 2.5 million Twitter followers:

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Bush was quick to reply with his own playful zinger, writing on Instagram to the 42nd president and fellow former White House resident: "Thanks, 42! Hope you like the book about your pal, #41. #HowAreYouSTILLNotOnInstagram #PresidentialGrammers #BrotherFromAnotherMother"

Clinton recently said on the Ellen DeGeneres's daytime talk show that he and Bush have bonded over becoming first-time grandfathers. Jenna Bush Hager, gave birth to a daughter, Mila, in 2013. Chelsea Clinton's daughter, Charlotte, was born in September. Clinton said Bush gave him this advice: "The most important thing you have to remember when you become a grandfather is, you immediately fall to last place on the family hierarchy!"

In a Tuesday “Today” show interview with the Bush family, former President George H.W. Bush also praised Clinton, who defeated him in his 1992 reelection bid.

“Bubba, he’s a good man. I like him,” Bush said.